First published in 1990. Routledge is an imprint of Taylor & Francis, an informa company.

First published in 1997. What's new in the Second Edition: Some 250 new entries, twenty-five percent more than in the first edition, plus twenty-five new expert contributors. Bibliographies are greatly expanded and updated throughout; More focus on biblical books and philosophical schools, their influence on early Christianity and their use by patristic writers; More information about the Jewish and pagan environment of early Christianity; Greatly enlarged coverage of the eastern expansion of the faith throughout Asia, including persons and literature; More extensive treatment of saints, monasticism, worship practices, and modern scholars; Greater emphasis on social history and more theme articles; More illustrations, maps, and plans; Additional articles on geographical regions; Expanded chronological table; Also includes maps.